Application of Impact Echo in Long Term Condition Monitoring of Concrete Bridge Decks — A Numerical Study

2007 ◽  
Author(s):  
Parisa Shokouhi ◽  
Nenad Gucunski
Keyword(s):  
Condition Monitoring ◽  
Numerical Study ◽  
Bridge Decks ◽  
Concrete Bridge ◽  
Impact Echo ◽  
Term Condition ◽  
Concrete Bridge Decks

FE Evaluation of Reinforced Concrete Bridge Decks with Glass-FRP Composite Bars

2016 ◽  
Vol 723 ◽  
pp. 776-781 ◽  
Author(s):  
Jian Wei Huang ◽  
Jonathan Davis
Keyword(s):  
Reinforced Concrete ◽  
Bridge Decks ◽  
Three Dimensional ◽  
Steel Corrosion ◽  
Concrete Bridge ◽  
Design Strength ◽  
Gfrp Bars ◽  
Concrete Bridge Decks ◽  
Gfrp Bar

In order to resolve the steel corrosion problem in bridge decks, glass fiber reinforced polymer (GFRP) has been recommended as a substitute to the conventional steel reinforcement in bridge decks. However, the use of GFRP bars in bridge decks is still limited by several concerns, including the long-term durability of GFRP bars in the concrete under sustained loadings. Literature review showed that the tensile strength reduction of the GFRP bar should be governed by the sustained stress level in the GFRP bar. In this regard, a GFRP reinforced concrete deck was simulated in this paper, aiming to investigate the sustained stress levels in the GFRP bars through three dimensional finite element (FE) modeling. Per AASHTO LRFD specifications, one lane loaded and two lane loaded cases were examined to identify the maximum tensile strains in the internal GFRP bars subjected to dead loads and HL-93 design loadings. The FE results showed that the maximum tensile stresses in GFRP bars under service loads were less than 1% of the GFRP design strength, which implied that the GFRP bars could have excellent long-term performance in real concrete bridge decks.

High-Speed Acoustic Impact-Echo Sounding of Concrete Bridge Decks

2020 ◽  
Vol 39 (3) ◽  
Author(s):  
Lorin J. Hendricks ◽  
Jared S. Baxter ◽  
Yao Chou ◽  
Mavrik Thomas ◽  
Enoch Boekweg ◽  
...  
Keyword(s):  
High Speed ◽  
Bridge Decks ◽  
Concrete Bridge ◽  
Impact Echo ◽  
Concrete Bridge Decks ◽  
Acoustic Impact ◽  
Echo Sounding

Evaluation of the Impact Echo Method for Concrete Bridge Decks with Asphalt Overlays

2019 ◽  
Vol 2673 (2) ◽  
pp. 436-444 ◽  
Author(s):  
Hoda Azari ◽  
Shibin Lin
Keyword(s):  
Bridge Decks ◽  
Cold Weather ◽  
Concrete Bridge ◽  
Portland Cement Concrete ◽  
Impact Echo ◽  
Temperature Range ◽  
Concrete Bridge Decks ◽  
Propagation Of Waves ◽  
Asphalt Overlays ◽  
The Impact

Asphalt overlays have been commonly used to extend the service life of deteriorated concrete bridge decks. Nonlinear, viscoelastic asphalt has properties that differ considerably from the properties of the underlying portland cement concrete (PCC) deck. The impact echo (IE) method has been extensively used to nondestructively evaluate PCC structures. The method, however, performs differently on asphalt overlays, especially when a membrane is placed between the overlay and the deck. The general recommendation has been to perform IE tests on asphalt overlays in cold weather. The temperature range under which IE can be used, however, is still uncertain. This study was conducted to systematically examine IE performance on asphalt overlays. Three PCC specimens with three types of asphalt overlays―asphalt with a liquid membrane, asphalt with a sheet membrane, and asphalt without a membrane―were tested in a temperature chamber. The three PCC specimens had identical designs, materials, and artificial defects. The nondestructive evaluation (NDE) results from the tests indicate that: (1) 32°F and below is the appropriate temperature range for IE to detect defects in the underlying deck; and (2) membranes can significantly reduce the propagation of waves into the underlying deck.

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